It's my understanding that the geometry of all the rear wishbones are the same. If I'm not mistaken, the 2mm difference is in the wheelbase when using the RB5/ZX5 Middle wishbones depending on which way round you mount them.
The Type B/B2 hubs have different ballstud locations for different length camber links. If you get the alloy upgrade hubs they have all 4 ballstud locations.
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